warns suspicious message only on differing domain (#2343)
warns suspicious message only on differing domain (#2343)

For example, the following is *not* suspicious:
```
From: 0beec7b5ea3f0fdbc95d0dd47f3c5bc275da8a33@example.org
Reply-To: 62cdb7020ff920e5aa642c3d4066950dd1f01f4d@example.org
```

While the following remains suspicious:
```
From: 0beec7b5ea3f0fdbc95d0dd47f3c5bc275da8a33@example.org
Reply-To: 0beec7b5ea3f0fdbc95d0dd47f3c5bc275da8a33@example.com
``` 

This commit fixes #2342.
simonft/nylas-mail,simonft/nylas-mail,nirmit/nylas-mail,simonft/nylas-mail,nylas/nylas-mail,nylas/nylas-mail,nylas-mail-lives/nylas-mail,nylas-mail-lives/nylas-mail,nirmit/nylas-mail,nylas-mail-lives/nylas-mail,nylas-mail-lives/nylas-mail,nylas/nylas-mail,nirmit/nylas-mail,nylas/nylas-mail,simonft/nylas-mail,nylas-mail-lives/nylas-mail,nirmit/nylas-mail,simonft/nylas-mail,nylas/nylas-mail,nirmit/nylas-mail